Martin Stuart "Marty" Feldstein (born November 25, 1939) is an economist. He is currently the George F. Baker Professor of Economics at Harvard University, and the president emeritus of the National Bureau of Economic Research (NBER). He served as President and Chief Executive Officer of the NBER from 1978 through 2008. From 1982 to 1984, Feldstein served as chairman of the Council of Economic Advisers and as chief economic advisor to President Ronald Reagan (where his deficit hawk views clashed with Reagan administration economic policies). He has also been a member of the Washington-based financial advisory body the Group of Thirty since 2003.

Feldstein was born in New York City and graduated from South Side High School in Rockville Centre, New York. He completed his undergraduate education at Harvard University (B.A., Summa Cum Laude, 1961) and then attended University of Oxford (B.Litt., 1963; D.Phil., 1967). He was also a Fellow of Nuffield College, Oxford from 1964 to 1967.

In 1977, he received the John Bates Clark Medal of the American Economic Association, a prize awarded every two years to the economist under the age of 40 who is judged to have made the greatest contribution to economic science. He is among the 10 most influential economists in the world according to IDEAS/RePEc. He is the author of more than 300 research articles in economics and is known primarily for his work on macroeconomics and public finance. He has pioneered much of the research on the working mechanism and sustainability of public pension systems. Feldstein is an avid advocate of Social Security reform and has been a main driving force behind former President George W. Bush's initiative of partial privatization of the Social Security system. Aside from his contributions to the field of public sector economics, he has also authored other important macroeconomics papers. One of his more well-known papers in this field was his influential investigation with Charles Horioka of investment behavior in various countries. He and Horioka found that in the long run, capital tends to stay in its home country – that is to say, a nation's savings is used to fund its investment opportunities. This has since been known as the “Feldstein-Horioka puzzle”.

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